Riddle: What am I?

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I am the black child of a white father, a wingless bird, flying even to the clouds of heaven.
I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth I am dissolved into air.

Came up with a few the other day, trying to space them out. Another 'what am I' riddle, this one should give you a definite "aha!" moment when you figure it out.
Push me, pull me
One end is quite prickly
I sound quite aggressive
If I'm said too quickly
What am I?